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Kilometre-high solar tower planned for Oz

Artist's impression of the solar power tower

If all goes to plan, a solar tower a mind-boggling one kilometre (3280
feet) high - nearly twice the height of the world's tallest building - will
be built in a remote part of Australia appropriately named Sunraysia, by the
end of 2010.

Cynics scoff at the idea, saying they'll believe it when they see it.
They point to the completion date having been repeatedly moved forward, and
the little problem of finding the one billion Australian dollars needed to
finance the project.

A search of the internet reveals that the 101-storey Taipei 101 in Taiwan
is the world's tallest building, with a height of 509m. (1670ft). By 2008 it
will be dwarfed by the 160-storey Burj Dubai tower, a three-cornered
skyscraper 800m. (2,624ft, just under half a mile) high. being built in
Dubai, United Arab Emirates.

"The quest for viable solar energy sources could be about to reach new
heights -- literally," CNN correspondent Grant Holloway reported from Sydney
two years ago.

"The tower is designed by structural engineer Professor Jörg Schlaich and
would use German-designed advanced lightweight construction techniques to
achieve its remarkable height.

"The tower would sit in the center of a seven kilometer (4 miles) radius
circular glass building. Air under the glass would be warmed by the sun. As
the warm air rises it would be drawn through turbines at the base of the
tower thus generating renewable electricity.

"A working prototype of the tower has already been built in Spain and the
design was judged one of Time magazine's 2002 inventions of the
year."

Last month (February 10, 2005) the New Zealand Herald ran a
detailed story under the heading Outback's solar tower will reach for the
sky. It reported that the Melbourne-based company Enviromission would
buy a 10,000 hectare (24,710 acre) slice of Tapio station at Buronga, New
South Wales, 25km (15.5 miles) northeast of Mildura, Victoria, to build the
tower.

Enviromission chairman Roger Davey would not confirm the purchase price,
but said it was "more than $A1 million" [$US785,175]. The agreement would be
signed in Mildura, 550km (342 miles) northwest of Melbourne, before an
audience of community leaders.

Two days later, the Albury (NSW) Border Mail, reported:

Plans hotting up for world's tallest
solar tower in NSW

Construction of the world's tallest engineered structure at Buronga,
New South Wales is increasingly likely to begin next year following a
crucial Federal Government vote of confidence in the one kilometre tall
Solar Tower project.

The recent accordance of Major Project Facilitation (MPF) status to
the $800 million venture, announced by Federal Industry Minister Ian
Macfarlane, means it will receive government support including help
through any necessary approval processes.

The tower will have a base the size of the Melbourne cricket ground,
spanning a diameter of 130 metres [426ft.], while the tower itself will
be about 300 metres [984ft.] taller than the current highest structures
in the world.

Surrounding the tower will be a skirt of solar collector panels with
a radius of 3.5 kilometres [2.17 miles]. These panels will gather hot
air to funnel through 32 wind turbines in the tower, creating 200
megawatts of clean, green renewable electricity. This output will make
the Solar Tower one of the largest single generators of renewable energy
in the world other than hydroelectric schemes.

If the tower IS finally built, it will certainly be a great tourist
attraction, visible from 100 miles (160km.) away in all directions. In view
of the sparse population, it seems unlikely that TV channels and FM radio
stations will compete for a prize transmission site from its top. But it
WILL need a beacon to fend off low-flying aircraft!